*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background: black;
}
#canvas1{
    border: 3px solid white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    max-width: 100%;
    max-height: 100%;
}
img{
    display: none;
}
#fullScreenButton{
    position: absolute;
    font-size: 20px;
    padding: 10px;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
}